Biopsy system
In the biopsy system according to one embodiment, the needle tube of the treatment tool has the minor axis of the flattened portion and the bending plane of the bending portion parallel to each other. Accordingly, the needle tube is easily bent in the bending direction of the bending portion, and even in an endoscope that has few bendable directions and is bendable, for example, in only two directions (e.g., up and down), the bending operation of the bending portion is not easily hindered. As a result, even after the treatment tool for endoscopes is inserted into the endoscope, the bending portion can be easily bent with a predetermined bending amount, and a procedure can be easily performed.
1. A biopsy system comprising:
an endoscope which includes an insertion section having a bending portion capable of being bent along a bending plane depending on an operation of an operation section; and
a treatment tool having a needle tube extended in a longitudinal direction, the treatment tube being configured to be inserted through the endoscope, the treatment tube being configured to be fixed to the endoscope by a fixing unit in a state where the treatment tool is inserted into the endoscope;
wherein the needle tube has a distal end portion, a proximal end portion and a flattened portion, the distal end portion, the proximal end portion and the flattened portion each having a cross-section perpendicular to the longitudinal axis with a major axis and a minor axis;
the flattened portion being provided between the distal end portion and the proximal end portion;
the minor axis of the flattened portion having a dimension smaller than a dimension of the major axis of each of the distal end portion, the proximal end portion and the flattened portion, and
the treatment tool is configured to be fixed to the endoscope by the fixing unit such that at least one surface at the minor axis of the flattened portion is parallel to the bending plane in the state where the treatment tool is inserted into the endoscope.
2. The biopsy system according to claim 1 , wherein a length and a position of the flattened portion are configured so that the flattened portion extends over a total length of the bending portion, in both a state where the needle tube is maximally advanced with respect to the endoscope and a state where the needle tube is maximally retracted with respect to the endoscope, when the treatment tool for endoscopes is inserted into and fixed to the endoscope.
3. The biopsy system according to claim 1 ,
wherein the needle tube has an opening surface at the distal end portion, and the opening surface extends from a distal point of the needle tube to a point on the needle tube that is more proximal than the distal point;
wherein the at least one surface comprises an upper surface and a lower surface; and
wherein the distal point is aligned with the upper surface of the flattened portion and the point more proximal than the distal point is aligned with the lower surface of the flattened portion.
4. The biopsy system according to claim 1 , wherein the needle tube comprises:
a first connecting portion connecting the distal end portion with the flattened portion, the first connecting portion having a dimension in a direction of the minor axis which increases in a taper angle in a direction moving away from the flattened portion toward the distal end portion; and
a second connecting portion connecting the proximal end portion with the flattened portion, the second connecting portion having a dimension in a direction of the minor axis which increases in a taper angle in a direction moving away from the flattened portion toward the proximal end portion; and
wherein the taper angle of the first connecting portion is greater than the taper angle of the second connecting portion.
5. The biopsy system according to claim 1 ,
wherein the treatment tool has a treatment tool operation unit configured to operate the needle tube,
the fixing unit is a holder that is provided at a distal end portion of the treatment tool operation unit, the holder having a pair of wall portions, and
the operation section of the endoscope is inserted through a space between the pair of wall portions, the treatment tool operation unit is fixed to the endoscope to fix the operation section such that the minor axis becomes parallel to the bending plane.
6. The biopsy system according to claim 5 ,
wherein the treatment tool operation unit has an operation body, a needle slider to which the needle tube is fixed and is slidably attached to the operation body, and a stopper that has a fixing screw, the stopper being attached to the operation body in order to regulate a movement range of the needle slider, and
wherein an axis of the fixing screw is arranged toward an axis of the operation section of the endoscope in a state where the treatment tool is fixed to the endoscope.
7. The biopsy system according to claim 1 , wherein the endoscope is an ultrasonic endoscope having an ultrasonic scanning mechanism provided on a distal end side of the bending portion.
8. The biopsy system according to claim 1 ,
wherein the cross-section of the flattened portion is oval;
wherein the cross-section of the distal end portion is circular such that the major axis of the distal end portion is equal to the minor axis of the distal end portion; and
wherein the cross-section of the proximal end portion is circular such that the major axis of the proximal end portion is equal to the minor axis of the proximal end portion.